The Losses in Piping Systems apparatus comprises a vertical panel with two separate hydraulic circuits, colourcoded for clarity. They also help when storing the apparatus. Each circuit includes various pipe system components. The unit has wheels for mobility. The small bore allows the circuits to include many pipe bends and components, while preserving effective upstream and downstream test lengths. The circuits are made of small-bore copper pipe, commonly used in a wide variety of applications such as domestic central-heating systems. Both circuits have common inlet and outlet pipes, controlled by valves. The valves are at the outlet to minimise flow disruption. The pressure gauge measures pressure loss across valves; the piezometer tubes measure pressure loss across the other components. To measure pressure loss across components, the panel includes piezometer tubes and a pressure gauge.